1266123031 has 2 divisors, whose sum is σ = 1266123032. Its totient is φ = 1266123030.

The previous prime is 1266123011. The next prime is 1266123037. The reversal of 1266123031 is 1303216621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1266123031 - 2⁷ = 1266122903 is a prime.

It is a super-2 number, since 2×1266123031² = 3206135059257253922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1266122987 and 1266123005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1266123037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633061515 + 633061516.

It is an arithmetic number, because the mean of its divisors is an integer number (633061516).

Almost surely, 2^1266123031 is an apocalyptic number.

1266123031 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266123031 is an equidigital number, since it uses as much as digits as its factorization.

1266123031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 1266123031 is about 35582.6225986787. The cubic root of 1266123031 is about 1081.8290425799.

Adding to 1266123031 its reverse (1303216621), we get a palindrome (2569339652).

The spelling of 1266123031 in words is "one billion, two hundred sixty-six million, one hundred twenty-three thousand, thirty-one".